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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7893a1e5598cc56bdcf84751d6a96088555bb0d6357027eb6b12264754ec915' 
  AND token = 'I5gABN6VwOK2QEyUCSm8LnG+gGpgb6ht2jBNDSB6e1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}