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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '432e55824ac11dada50c4260f0c29d07ff446576b85d0c33eae9886a1af12c44' 
  AND token = '8L38yYWCVHVG6uWJujt0IC9g8DUP+273+SyXTejrSBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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