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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb5d1109e7e9231952610359522129201f4a881a45b2d242aa45797ab81b951e' 
  AND token = 'bYr3VIeuMPa0tLfrX8xY48ZftjdAcOTHzL4YlEsz5do=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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