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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '878c585a2aab2f8f41c271c3ad6227a54a0b656086e23194066bcf84ab8f4d36' 
  AND token = 'VFh04Yo4eryXUgGczXv+QDWJdzMMoNzMhrx2Q2IKDXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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