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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2fc7bc21fc8c4302f4cb98cc657309193dff90c5ca8fe337226ad5f07d586d8' 
  AND token = 'QHi2CRYU8j8TdeqSlpoQoLxmRweXgeGuOybVqG/aito=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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