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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea5a7f2d30d2de9dd221423d2511c2dc98832b4ea9c9e583ecc7e065063c9c38' 
  AND token = '4DJL3L3afaQ66doznJJYjZHsvheWZtsFSpzlRGqPTIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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