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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36be9123671e664ffd75163e856dd47871c00c1316b5ee6ced0452dbc2ad85bf' 
  AND token = 'mC47G2w91jGSpBtgSKUNX9RUNB0sx06m6D8vowp1M6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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