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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11879e4bf79a58c2463266f97aa100a601783ea87eb9b5ae279237a83f6212ca' 
  AND token = 'JfPdFAepo+0Fi67J16k4TvoYKw5WYG+isVHgy1bFD/E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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