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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd1ee792df0e9252a42cfd15dec4a18185d443cf04e65bfaa212db2456873b5f' 
  AND token = 'fiQQK/P3Lg228uhVxZ8YzpXQ74hhgTCb/sk8Rte2FCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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