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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7da4a6b20fa54c4b08f94be6ebe7ea3f63281f9f7156fa81bd95c6c91d0a1a5a' 
  AND token = 'bsMpSiXVlsfZuJ7qaP+rzcDKjvEcL1cckmcTwLhG0do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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