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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61f8ff6b3c222d5e1109cc3256f69b570b5757564dcbcabd5ce785fc65905955' 
  AND token = 'ois3Jj86RDsCBvrsZK2H391ttC/Mo06PlAMAE9W3YRA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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