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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd027f5cc3cf3bab8c898cbf66a69a070e4375e00e66752e53f7e7fda907ff7cd' 
  AND token = 'BHf4+pDGt4WcXoyUvIf4qIQFGhpJN5k5gL9sMBBWyvw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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