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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3be814125ba7f23c7c2003c29d7617c2d81835ec1eb46a5102a9abd4c8ff296' 
  AND token = 'PEXbeKRwzN9QJ3haed9VX6maGd+YHfAO6gaI7MLiM18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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