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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48b761233c451d68aad8651691adb329537afeea6e4133c4bcfc092494dc89e3' 
  AND token = 'iwxaaTH2rdM6EecKncq5wt4ytc1T+fLLLidn2lDn28w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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