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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9bf5b5c972fd27558c06da07a0dded9a2f933858ae49022340510e14df08c48c' 
  AND token = 'oI9axqkKBcOU2fFHgqY1qO2odaPDri0FGFd3IcSkrXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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