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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6c441ad48191eb7a88a23e5341771c4f6a7a0251c8d9c15367753b75fc9058d' 
  AND token = 'dCr9tUQmHoyFIc2na9HIb8KhaBSW3mkGdQzv6/6AbJs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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