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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d967a5de425627c96db82680ca2aa6c4b273676ef454088b3a336ebddee1282' 
  AND token = 'XEP9VPtBRxCQS1X60D8C2ekTSXlP7FNo4+dS1ybnWCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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