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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59077e74b7e8859e13f1ea8aebc33fdb1a52f66eff79f79e15cca77c32e40160' 
  AND token = 'E8ar5iuZqW3AYUBf3m/DMSGFHcGQofzxIcSqjPuKN3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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