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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bfcecec41c48e1f88e9c755bd96e2b9f7d4064bd007dfd124c95bf63c5fc4c1b' 
  AND token = '5+EGrAtArUxFAdhsVG/BeiISDHfqF2dnhxxYzzwqeBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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