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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cffab65914aebf278aa1a4343df1317b528aa419972a89c6cbd2a6e5301e10a2' 
  AND token = 'QAuLlehLIVx9/6E63gldwSvWEUqp9ofG4Oo6cUqp2sQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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