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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2e067aebdd83d42e84450b17847083d037b95b84df6c5a790faeae00feed1d0' 
  AND token = 'VOCK+vMZueFVqwa4+D7PjjqXdd6/ehgjDvWFdINVYb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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