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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd32f4b92a024c24cbce1ff3c2cf6f9c4647c034a7a2306fa7d49f25ecbfb372' 
  AND token = 'YGbOrYAv2cErHX2zawULve1Nqv3gz5BSfUqlIZBOh7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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