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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59545dc2fafb97162e62ec6e4ec02817a35360fc3a66a96df88be48e8d4ef4af' 
  AND token = 'D34WaiudXHPmNQCRPy0kjI1zt5nRQzeDrnxMIyJiR+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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