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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1dcebc55b803fb52f3317fdd6fd74b139c00738f01fd2070bcef9d8a3fb7f5a9' 
  AND token = 'IX+pEE4aHpidvf0yBvDU80cRvXP4IbH1h/CMDYpqzy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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