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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '469fdafd7426c5b3f1f4e579d983c5bd34edc662e725e4d03a4ddbc7f92376cc' 
  AND token = 'n1Xjqfc5X3VrN/yede7gkJSW/HhJ7jrAnSxDsR1rqkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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