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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4f81b6efeaba9606b877ddee5caa6bbb50829bba09fc8a0d6f833d0dd6840a7' 
  AND token = 'NA9H0pVw7ilSJsOFFL7QHnuXhA7/3Kyx3A3V6+CZTDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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