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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a62527643af490b0e3f31e21c7e77529b2a3b2eecdadf9b9042ddf5d562877bf' 
  AND token = 'DKSFB8iCJ5eC0VhObdznNaKcZV66BNbwnrZCG7nob9w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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