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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0844f4d09095e6f9aec2e93975fdbd7f4ad3baeb451b35739ac19e96bd16a2fb' 
  AND token = 'pTuPcBWfI6mkL2S5HUWgzbosJjEwjJfn96V4l1ki2/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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