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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06b9f477b26e2327423cd61371af5369ae3ce50ed4630570b3bdaf9c58b6e065' 
  AND token = 'SiET6OFXQjBs3yl4QcX0M4NLMG9swKmBwkIRb+3wlsI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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