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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff7ae894faeb43e1a6461cfee9067b98bd4a88e996e0fa77036b7db21bd7a5b8' 
  AND token = 'EvmJZ6EetCy7oraKD6ybbyKRRkrobBQZNdCgaYVIv/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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