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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2afbedd16ca144aa2d5c8b4b05e95bd3546050aaa2b0902254dcfcbc6ad51e57' 
  AND token = 'Vaq77/Q8MHcec4a0b+lSCSTfZhQjHJGbZN1pBKt8o6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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