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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ec813e06a3630cd6ef45fd15de030dbcfca04ac59ef8dc6f81af1d354a6185d' 
  AND token = 'i405mPPle1gzv39b/BWbB1d21tCMTTAZ4CmDaSeyYds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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