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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ab772b4925871659adfeb389c328729ee1701414842839fc0f9fbf8e4873ef02' 
  AND token = 'RgJT6QLrX1XH2739uPoAUzF/S86FHGdyF+nic+pQbL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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