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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3f87b7f176ebe408c2f0aad827a366b5912c34e0ea785875362ce05fd2c4239' 
  AND token = '/2fo4pmZ591BJQPDW1TvG42mDVS/8Gtqqo29LpNbCNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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