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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5d688b0ec26e5d484ecb96378f52e8a5d2b1ae2333297db16555dcfd93206e7' 
  AND token = 'wsG9rPVHHMbWGHfeOJ6Lq5vbOrpY6ZztpkD4YE2Ul5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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