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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94d8a9ee9e27a04a21c94c0dbad6a5a8b9fea1d634e970bc068b0e36fb94a6de' 
  AND token = 'rT6nGKgrQx+9aKzcrG8WHrAOADU9O8B9mk/nBNGSMRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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