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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af5540346da2e373561175e7096a9d5ed6bff0218acad42ad54756c88a0d1934' 
  AND token = 'IZ/91lGIIDdHMw05uy55BQdV+Wj5kTbwRHc42rM73zI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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