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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f9937cf76fec21a73885656c5786bfb918b8d3729e45a80322e6cc1c2956f20' 
  AND token = 'Eo6wZsWyv98F7t/6K6BOv5y+2GWrErvB1XNGuXH9hb0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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