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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ed02ffb0ed4cc4e6f1d82bce648756b1d79401009f8dc09c8504e1045bf996' 
  AND token = '14FU6qHXMs63bKkKB/O6kgItqD278Gj4bOWTGaiPMZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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