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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '977a539691c41b1a87dc8c5774703838746f53eb11201ef3e5656caaac1615f3' 
  AND token = 'e7Km5JO75mOLItCFG8ufkJunJ89AJ34bNvL+1gKlLjE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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