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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '827911e46f5cf7a50987a44dd513ce5860d23dbae6f3739b83a401cf7ecdf4d8' 
  AND token = 'uT9BLsDQvk8IAHDWTSWSSvA0AWjTvNDiQi+1hSblzZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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