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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '263dae00069174e9041d465285cd8e8c2abaa92283dbc2eeab66b6df8e11e001' 
  AND token = 'qfbvFZ3dSy3B/HMVsVlTBMAOD1lnc6wL/e56Q/b8Nc4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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