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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f79fa9b709e54797d5314ef0c0b8d80cb86b51663775532508c72ddd0e40134a' 
  AND token = '0Sx+stgEE74xewTn/mfXmBMdyOHmRptCrGSYo9w87g8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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